wings/server/server.go

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package server
import (
"context"
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"fmt"
"github.com/apex/log"
"github.com/patrickmn/go-cache"
"github.com/pkg/errors"
"github.com/pterodactyl/wings/api"
"golang.org/x/sync/semaphore"
"os"
"strings"
"sync"
"time"
)
// High level definition for a server instance being controlled by Wings.
type Server struct {
// Internal mutex used to block actions that need to occur sequentially, such as
// writing the configuration to the disk.
sync.RWMutex
// Maintains the configuration for the server. This is the data that gets returned by the Panel
// such as build settings and container images.
cfg Configuration
// The crash handler for this server instance.
crasher CrashHandler
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resources ResourceUsage
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Archiver Archiver `json:"-"`
Environment Environment `json:"-"`
Filesystem Filesystem `json:"-"`
// Server cache used to store frequently requested information in memory and make
// certain long operations return faster. For example, FS disk space usage.
cache *cache.Cache
// Events emitted by the server instance.
emitter *EventBus
// Defines the process configuration for the server instance. This is dynamically
// fetched from the Pterodactyl Server instance each time the server process is
// started, and then cached here.
procConfig *api.ProcessConfiguration
// Tracks the installation process for this server and prevents a server from running
// two installer processes at the same time. This also allows us to cancel a running
// installation process, for example when a server is deleted from the panel while the
// installer process is still running.
installer InstallerDetails
}
type InstallerDetails struct {
// The cancel function for the installer. This will be a non-nil value while there
// is an installer running for the server.
cancel *context.CancelFunc
// Installer lock. You should obtain an exclusive lock on this context while running
// the installation process and release it when finished.
sem *semaphore.Weighted
}
// Returns the UUID for the server instance.
func (s *Server) Id() string {
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return s.Config().GetUuid()
}
// Returns all of the environment variables that should be assigned to a running
// server instance.
func (s *Server) GetEnvironmentVariables() []string {
zone, _ := time.Now().In(time.Local).Zone()
var out = []string{
fmt.Sprintf("TZ=%s", zone),
fmt.Sprintf("STARTUP=%s", s.Config().Invocation),
fmt.Sprintf("SERVER_MEMORY=%d", s.Build().MemoryLimit),
fmt.Sprintf("SERVER_IP=%s", s.Config().Allocations.DefaultMapping.Ip),
fmt.Sprintf("SERVER_PORT=%d", s.Config().Allocations.DefaultMapping.Port),
}
eloop:
for k := range s.Config().EnvVars {
for _, e := range out {
if strings.HasPrefix(e, strings.ToUpper(k)) {
continue eloop
}
}
out = append(out, fmt.Sprintf("%s=%s", strings.ToUpper(k), s.Config().EnvVars.Get(k)))
}
return out
}
func (s *Server) Log() *log.Entry {
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return log.WithField("server", s.Id())
}
// Syncs the state of the server on the Panel with Wings. This ensures that we're always
// using the state of the server from the Panel and allows us to not require successful
// API calls to Wings to do things.
//
// This also means mass actions can be performed against servers on the Panel and they
// will automatically sync with Wings when the server is started.
func (s *Server) Sync() error {
cfg, rerr, err := s.GetProcessConfiguration()
if err != nil || rerr != nil {
if err != nil {
return errors.WithStack(err)
}
if rerr.Status == "404" {
return &serverDoesNotExist{}
}
return errors.New(rerr.String())
}
return s.SyncWithConfiguration(cfg)
}
func (s *Server) SyncWithConfiguration(cfg *api.ServerConfigurationResponse) error {
// Update the data structure and persist it to the disk.
if err := s.UpdateDataStructure(cfg.Settings, false); err != nil {
return errors.WithStack(err)
}
s.Lock()
s.procConfig = cfg.ProcessConfiguration
s.Unlock()
return nil
}
// Reads the log file for a server up to a specified number of bytes.
func (s *Server) ReadLogfile(len int64) ([]string, error) {
return s.Environment.Readlog(len)
}
// Determine if the server is bootable in it's current state or not. This will not
// indicate why a server is not bootable, only if it is.
func (s *Server) IsBootable() bool {
exists, _ := s.Environment.Exists()
return exists
}
// Initalizes a server instance. This will run through and ensure that the environment
// for the server is setup, and that all of the necessary files are created.
func (s *Server) CreateEnvironment() error {
return s.Environment.Create()
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}
// Gets the process configuration data for the server.
func (s *Server) GetProcessConfiguration() (*api.ServerConfigurationResponse, *api.RequestError, error) {
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return api.NewRequester().GetServerConfiguration(s.Id())
}
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// Helper function that can receieve a power action and then process the
// actions that need to occur for it.
func (s *Server) HandlePowerAction(action PowerAction) error {
switch action.Action {
case "start":
return s.Environment.Start()
case "restart":
return s.Environment.Restart()
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case "stop":
return s.Environment.Stop()
case "kill":
return s.Environment.Terminate(os.Kill)
default:
return errors.New("an invalid power action was provided")
}
}
// Checks if the server is marked as being suspended or not on the system.
func (s *Server) IsSuspended() bool {
return s.Config().Suspended
}